A material crushing system for a drying process in polyvinyl chloride production

Abstract

This utility model relates to the technical field of polyvinyl chloride (PVC) production and processing equipment, specifically a material crushing system for the drying process of PVC production. The system includes a centrifuge, an airflow drying tower, and an air filter. Bearing brackets are installed on both sides of the airflow drying tower, and bearings are detachably connected to the inner walls of both brackets. A main shaft is inserted into one side of one of the bearings. Multiple crushing blades are evenly arranged on the outer surface of the middle section of the main shaft. A coupling is detachably connected to one end of the main shaft, and a drive motor is engaged at the other end of the coupling. This material crushing system for the PVC production drying process, through the coordinated arrangement of the main shaft, crushing blades, coupling, and drive motor, allows the drive motor to drive the main shaft and crushing blades to rotate when resin deposits at the bottom of the airflow drying tower, crushing the resin at the bottom of the tower into particles. This solves the problems of adhesion and material accumulation clogging in the drying system during the production of homopolymer PVC resin.

Description

Technical Field

[0001] This utility model relates to the technical field of polyvinyl chloride (PVC) production and processing equipment, specifically a material crushing system for the drying process of PVC production. Background Technology

[0002] Polyvinyl chloride, or PVC for short, is a polymer formed by the free radical polymerization of vinyl chloride monomer under the action of initiators such as peroxides and azo compounds, or under light and heat conditions. In the production of PVC homopolymer resin, suspension polymerization is one of the most widely used processes. This process occupies an important position in the industry due to its mature and stable technical system and excellent product quality. The core mechanism of suspension polymerization is to allow the vinyl chloride monomer to complete the polymerization reaction in a suspended state in an aqueous system.

[0003] The suspension polymerization method is widely used not only because of its simple process and ease of large-scale industrial production, but also because it produces PVC resin with high purity and no emulsifier residue, which can meet the processing needs of various downstream products such as pipes, profiles, and films. When using the suspension polymerization method, the PVC slurry formed after the polymerization reaction needs to undergo a series of post-processing steps. Among these, a drying system is required to dry the PVC resin particles to meet the specified moisture content standards. This drying process is a key step in ensuring the storage stability and subsequent processing performance of PVC resin. By removing residual moisture from the resin particles, problems such as clumping and mold growth during storage can be effectively avoided, while ensuring uniform plasticization during molding and processing, thus guaranteeing the quality of the final product.

[0004] However, existing technologies have the following problems in practical use;

[0005] After centrifugation and dehydration, the resin has a high moisture content and is prone to agglomeration and adhesion. When the agglomerated resin is transported to the airflow drying tower, the lumpy resin cannot be fully dispersed by the hot air, which hinders the drying process. Under these circumstances, the resin will deposit at the bottom of the airflow drying tower. As the operating time accumulates, the deposits will increase the impurities and moisture content in the resin, which will cause serious blockage of the airflow drying tower. Such blockage may not only cause process safety accidents, but also have a negative impact on the normal production process. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] To overcome the aforementioned deficiencies in the prior art, this utility model provides a material crushing system for the drying process of polyvinyl chloride (PVC) production. This system addresses the problem mentioned in the background art where, after centrifugal dehydration, the resin has a high moisture content and is prone to agglomeration and adhesion. When the agglomerated resin is transported to the airflow drying tower, the lumpy resin cannot be fully dispersed by the hot air, hindering the drying process. In this situation, the resin will deposit at the bottom of the airflow drying tower. As the operating time accumulates, the deposits increase the impurities and moisture content in the resin, leading to severe blockage of the airflow drying tower. Such blockages can not only cause process safety accidents but also negatively impact normal production processes.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a material crushing system for the drying process of polyvinyl chloride production, comprising a centrifuge, an airflow drying tower, and an air filter. Bearing brackets are provided on both sides of the airflow drying tower, and bearings are detachably connected to the inner walls of both bearing brackets. A main shaft is inserted into one side of one of the bearings. One end of the main shaft passes through the bearing and the airflow drying tower from left to right and enters the interior of the other bearing. Multiple crushing blades are evenly distributed on the outer surface of the middle section of the main shaft. A coupling is detachably connected to one end of the main shaft, and a drive motor is engaged at the other end of the coupling.

[0010] Preferably, packing is wrapped around the end face of the main shaft that is in contact with the airflow drying tower, and a high-pressure nozzle is provided on the inner wall of the airflow drying tower near the main shaft.

[0011] Preferably, a feed pipe is fixedly connected to one side of the centrifuge, and a discharge pipe is provided on the side of the centrifuge near the feed pipe.

[0012] Preferably, a U-shaped material trough is provided at the other end of the discharge pipe, and a screw rod is rotatably connected to the inner wall of the U-shaped material trough. A servo motor is detachably connected to one end of the U-shaped material trough, and the output end of the servo motor passes through one side of the U-shaped material trough and is snapped into the inside of one end of the screw rod. A discharge port is provided at the other end of the U-shaped material trough, and one side of the discharge port is detachably connected to the input end of the airflow drying tower.

[0013] Preferably, the output end of the air filter is provided with a first air supply pipe, the other end of the first air supply pipe is detachably connected to a blower, the output end of the blower is provided with a second air supply pipe, the other end of the second air supply pipe is detachably connected to an air heater, the output end of the air heater is provided with a third air supply pipe, and the other end of the third air supply pipe is connected to the lower flange of the airflow drying tower.

[0014] Preferably, the output end of the airflow drying tower is provided with a feeding pipe for transmission, the other end of the feeding pipe is provided with a cyclone drying bed, and one end of the cyclone drying bed is provided with a discharge pipe.

[0015] (III) Beneficial Effects

[0016] This utility model provides a material pulverizing system for the drying process in polyvinyl chloride production, which has the following beneficial effects:

[0017] This material crushing system for the drying process in polyvinyl chloride (PVC) production utilizes a combination of a main shaft, crushing blades, a coupling, and a drive motor. When resin settles at the bottom of the airflow drying tower, the driving force generated by the motor rotates the main shaft and crushing blades, continuously crushing the resin at the bottom of the tower into fine particles. These particles are then re-entrained by the rising hot air from the bottom of the tower and move upwards with the airflow, preventing accumulation. The crushing action of the crushing blades effectively solves the problems of adhesion and material accumulation clogging in the drying system during the production of homopolymer PVC resin, while also reducing the risks associated with frequent clogging of the drying system. The shutdown and cleaning significantly improves the operating efficiency of the equipment and effectively reduces the labor intensity of the operators. When the main shaft rotates, the bearings reduce the resistance of the main shaft rotation through rolling friction, ensuring that the main shaft can rotate smoothly at high speed and reduce mechanical wear. The coupling connects the main shaft and the output end of the drive motor to realize power transmission, compensate for the installation error between the two shafts, buffer the impact load during rotation, and protect the motor and the main shaft. At the same time, the bearing bracket can provide a stable mounting base for the bearing, ensuring that the bearing does not shift when the main shaft rotates at high speed, and maintaining the stability of the crushing blade, main shaft and bearing structures. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the main shaft structure of this utility model;

[0020] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0021] Figure 4 This is a schematic diagram of the U-shaped material trough structure of this utility model.

[0022] In the diagram: 1. Centrifuge; 2. Airflow drying tower; 3. Air filter; 4. Bearing bracket; 5. Bearing; 6. Main shaft; 7. Crushing blade; 8. Coupling; 9. Drive motor; 10. Packing; 11. Feed pipe; 12. Discharge pipe; 13. U-shaped trough; 14. Screw; 15. Servo motor; 16. Discharge port; 17. First air supply pipe; 18. Blower; 19. Second air supply pipe; 20. Air heater; 21. Third air supply pipe; 22. Feed pipe; 23. Cyclone drying bed; 24. Discharge pipe; 25. High-pressure nozzle. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Example 1;

[0025] Please see Figure 1 , Figure 2 and Figure 3 This utility model provides a technical solution: a material crushing system for the drying process of polyvinyl chloride production, including a centrifuge 1, an airflow drying tower 2, and an air filter 3. The output end of the air filter 3 is provided with a first air supply pipe 17, the other end of which is detachably connected to a blower 18. The output end of the blower 18 is provided with a second air supply pipe 19, the other end of which is detachably connected to an air heater 20. The output end of the air heater 20 is provided with a third air supply pipe 21, the other end of which is connected to the lower flange of the airflow drying tower 2. Bearing brackets 4 are provided on both sides of the airflow drying tower 2, and the inner walls of both bearing brackets 4 are detachably connected to... Bearing 5, one side of which is inserted into a main shaft 6. The outer surface of the main shaft 6 is wrapped with packing 10 at the end face that contacts the airflow drying tower 2. A high-pressure nozzle 25 is provided on the inner wall of the airflow drying tower 2 near the main shaft 6. One end of the main shaft 6 passes through the bearing 5 and the airflow drying tower 2 from left to right and enters the interior of another bearing 5. Multiple crushing blades 7 are evenly arranged on the outer surface of the middle part of the main shaft 6. One end of the main shaft 6 is detachably connected to a coupling 8. The other end of the coupling 8 is clamped to a drive motor 9. The output end of the airflow drying tower 2 is provided with a feeding pipe 22 for transmission. The other end of the feeding pipe 22 is provided with a cyclone drying bed 23. One end of the cyclone drying bed 23 is provided with a discharge pipe 24.

[0026] Through the above technical solution, during use, the air filter 3 can purify the air entering the system, filtering out dust, impurities, and other pollutants from the air, preventing them from mixing into the materials and affecting the purity of the polyvinyl chloride product. In particular, it can reduce the number of impurity particles in the finished product, ensuring product quality. After filtration, the air is sent into the blower 18 through the first air supply pipe 17. The blower 18 pressurizes the filtered air, and the pressurized gas is sent into the air heater 20 through the second air supply pipe 19. It can also control the air intake volume to ensure a stable airflow field is formed in the airflow drying tower 2. When the main shaft 6 rotates, the packing 10 is wrapped around the end face of the main shaft 6 that contacts the airflow drying tower 2. Its elastic deformation fills the gap and plays a sealing role, preventing the leakage of hot air and materials in the airflow drying tower 2, while blocking the entry of outside air, maintaining the stability of the pressure and temperature inside the tower, and simultaneously pressurizing the high pressure. The nozzle 25 is connected to an external high-pressure gas device. During use, the high-pressure nozzle 25 delivers high-pressure gas into the airflow drying tower 2 to blow away the resin material, keeping it away from the end face of the main shaft 6 that is in contact with the airflow drying tower 2, thus preventing the resin material from entering and causing blockage. At the same time, it further ensures the airtightness between the inside of the airflow drying tower 2 and the outside. With the help of the feed pipe 22, the airflow drying tower 2 can be connected to the cyclone drying bed 23. The pre-dried material and the airflow mixture are transported to the cyclone drying bed 23. The cyclone drying bed 23 uses hot airflow to carry material particles in a tangential direction. The material particles rotate along the hot wall in the bed and are in a suspended rotating state for further drying. At the same time, the particles are crushed due to the impact with the wall, which strengthens the drying process. The material dried by the cyclone drying bed 23 is discharged through the discharge pipe 24 and transported to the subsequent screening and packaging processes.

[0027] Example 2;

[0028] Please see Figure 1 and Figure 4 This utility model provides a technical solution based on Embodiment 1. A feed pipe 11 is fixedly connected to one side of the centrifuge 1. A discharge pipe 12 is provided on the side of the centrifuge 1 near the feed pipe 11. A U-shaped material trough 13 is provided at the other end of the discharge pipe 12. A screw rod 14 is rotatably connected to the inner wall of the U-shaped material trough 13. A servo motor 15 is detachably connected to one end of the U-shaped material trough 13. The output end of the servo motor 15 passes through one end of the U-shaped material trough 13 and is snapped into the inside of one end of the screw rod 14. A discharge port 16 is opened at the other end of the U-shaped material trough 13. One side of the discharge port 16 is detachably connected to the input end of the airflow drying tower 2.

[0029] Through the above technical solution, the polyvinyl chloride slurry can be fed into the centrifuge 1 through the feed pipe 11. At the same time, the centrifuge 1 uses the centrifugal force generated by high-speed rotation to separate the polyvinyl chloride slurry into solid and liquid, reduce the moisture content of the material, and lay the foundation for the subsequent drying process. After the separation is completed, the wet material dehydrated by the centrifuge 1 is transported to the U-shaped material trough 13 through the discharge pipe 12. At the same time, the driving force generated by the servo motor 15 drives the screw rod 14 to rotate, and the material is transported to the discharge port 16. The material conveyed by the screw is guided into the airflow drying tower 2 for processing through the discharge port 16.

[0030] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power via standard interfaces. The main controller can be any commercially available known device. There are no special restrictions on the specific models of the electrical components; any commercially available ordinary products can be selected, as long as they meet the usage requirements of this utility model.

[0031] In this invention, the working steps of the device are as follows:

[0032] First, the air filter 3 is activated, allowing outside air to enter and be filtered to remove dust, impurities, and other pollutants. The purified air is then delivered to the blower 18 via the first air supply pipe 17. The blower 18 is activated to pressurize the purified air, and simultaneously, the pressurized air is sent to the air heater 20 via the second air supply pipe 19. The air intake is controlled by adjusting the power of the blower 18 to ensure a stable airflow field within the airflow drying tower 2. The air heater 20 is activated to heat the incoming air to a temperature suitable for the drying requirements of polyvinyl chloride (PVC). The heated air is then delivered to the bottom of the airflow drying tower 2 via the third air supply pipe 21 to provide a heat source for subsequent drying. At the same time, the PVC slurry enters the centrifuge 1 via the feed pipe 11. The centrifuge 1 is activated and rotates at high speed, using centrifugal force to achieve solid-liquid separation. The separated wet material is discharged through the discharge pipe 12. The material enters the U-shaped trough 13, and then the servo motor 15 is started to drive the screw rod 14 to rotate. The screw rod 14 propels the material along the U-shaped trough 13 to the discharge port 16. Finally, the material is guided into the interior of the airflow drying tower 2 through the discharge port 16. The airflow drying tower 2 suspends the material in the hot airflow inside and evaporates the moisture quickly. At the same time, the drive motor 9 is started, and its driving force is transmitted to the main shaft 6 through the coupling 8. The main shaft 6 drives the crushing blades 7 to rotate synchronously, cutting and crushing the material deposited at the bottom of the airflow drying tower 2. The crushed fine particles are re-entrained by the hot air rising from the bottom of the tower and move upward with the airflow. The moisture evaporates quickly in the heat exchange. The material and airflow mixture after preliminary drying enter the cyclone drying bed 23 through the feeding pipe 22 for further drying. The dried material is discharged through the discharge pipe 24 to the subsequent screening and packaging processes.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A material pulverizing system for the drying process in polyvinyl chloride production, comprising a centrifuge (1), an airflow drying tower (2), and an air filter (3), characterized in that: Both sides of the airflow drying tower (2) are provided with bearing fixing frames (4). The inner walls of the two bearing fixing frames (4) are detachably connected with bearings (5). A main shaft (6) is inserted into one side of one of the bearings (5). One end of the main shaft (6) passes through the bearing (5) and the airflow drying tower (2) from left to right and enters the interior of the other bearing (5). Multiple crushing blades (7) are evenly arranged on the outer surface of the middle part of the main shaft (6). One end of the main shaft (6) is detachably connected with a coupling (8). The other end of the coupling (8) is clamped with a drive motor (9).

2. The pulverizing system for drying process materials in the production of polyvinyl chloride according to claim 1, characterized in that: Packing (10) is provided around the end face of the main shaft (6) that is in contact with the airflow drying tower (2), and a high-pressure nozzle (25) is provided on the inner wall of the airflow drying tower (2) near the main shaft (6).

3. The polyvinyl chloride production drying process material pulverizing system according to claim 1, characterized in that: A feed pipe (11) is fixedly connected to one side of the centrifuge (1), and a discharge pipe (12) is provided on the side of the centrifuge (1) near the feed pipe (11).

4. The polyvinyl chloride production drying process material pulverizing system according to claim 3, characterized in that: The other end of the discharge pipe (12) is provided with a U-shaped material trough (13). The inner wall of the U-shaped material trough (13) is rotatably connected to a screw rod (14). One end of the U-shaped material trough (13) is detachably connected to a servo motor (15). The output end of the servo motor (15) passes through one side of the U-shaped material trough (13) and is clamped inside one end of the screw rod (14). The other end of the U-shaped material trough (13) is provided with a discharge port (16). One side of the discharge port (16) is detachably connected to the input end of the airflow drying tower (2).

5. The material pulverizing system for the drying process in polyvinyl chloride production according to claim 1, characterized in that: The air filter (3) is provided with a first air supply pipe (17) at its output end. The other end of the first air supply pipe (17) is detachably connected to a blower (18). The output end of the blower (18) is provided with a second air supply pipe (19). The other end of the second air supply pipe (19) is detachably connected to an air heater (20). The output end of the air heater (20) is provided with a third air supply pipe (21). The other end of the third air supply pipe (21) is connected to the lower flange of the airflow drying tower (2).

6. The polyvinyl chloride production drying process material pulverizing system according to claim 1, characterized in that: The output end of the airflow drying tower (2) is provided with a feeding pipe (22) for transmission, and the other end of the feeding pipe (22) is provided with a cyclone drying bed (23), and one end of the cyclone drying bed (23) is provided with a discharge pipe (24).

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